user
Create at least 3 test cases for this function.

def calculate_area(length, width):
    return length * width


assistant
Test Case 1:
Input: Length = 5, Width = 8
Expected Output: 40

Test Case 2:
Input: Length = 10, Width = 10
Expected Output: 100

Test Case 3:
Input: Length = 0, Width = 3
Expected Output: 0